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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6553fc97930b0a823a93482a6ceabbe82d6360261957db424bc4c727df2df504' 
  AND token = 'TmH3oNyuVvbf3wmY2ss9UJi0iM0SF9HcJi7hiMhP96o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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