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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9776f176f593cbd5c6e2d965b6da98e1aaae317f7d256ea26e44cc2c84c85778' 
  AND token = '560CnYxhK867BzEk2Pz8rkMJ/Swe7WD5TurhtN0n22o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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