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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f075fab0e0ec716f11da5da6f125cde9c011a25fbcb34a6f8e34f38456e7cdd8' 
  AND token = '49apnR6oDcJTllkicQ2fQpxPpEEEKSXv7AC5oj/26uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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