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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b60d03c23ac0ce91a788f632984c22da9ccd6a74cbcd1aaa66e2d4a41fa82cf' 
  AND token = 'fL1ESBMAQrLkCOLNSqeICFJGLXo0z+TvjPpZGS3b3oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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