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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7971b71ddf4a22af32ce5d9fb43b7f94b224ece1295a3659f8d029123af2da9' 
  AND token = 'pHLsr82hsGUfMdlyVeT1MOQebD5E53DZBJMQPn9OrS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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