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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e6370a3af945bc512802735be81d2ad8e060a901c7c2ca3d8e80146e7bb2b6' 
  AND token = '61NMDEj0Obc3Bs9AAgVag1O/N9lpMw66+Ar4ToS208s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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