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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ebdc50ad880132fd6b4a4432d958937e9ed78e4bac0340dd357ec57cf921b6' 
  AND token = '4S8jMFDw6aNbjzkLqcX+J66/sz7UGHz+8Z84eYqsw2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}