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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc59eefd6254be8477f8cd651eaf0c3794cfb6bfdbbb22829f81cea1e721552c' 
  AND token = 'ztv8AhA0Ethb58rnzubSGrq9rDa1l4/pnc7UUEnuz2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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