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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68850c2b45436e9eec7a2cff72414f90f980ee48e775781e03d4d301810176f5' 
  AND token = '3uQieIU6Xvp6+fKAf91Z5ms+Vjs3/nlkR9JnqdK6bds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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