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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a68ddc9e46a04f54c388e04a3e1c8ff33f6928f3410abe8836f43da04155c4' 
  AND token = 'DaqBGlpVpJ2igzGRFUkBP8x5LITWLvxS7eEv5naYHeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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