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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd7935d65f7d8f481778663756828d51185c6761c32d5f38f73022956668a29' 
  AND token = '9B3NzkWpk9+4enr4Kfs7nZSJ+uEhUAvpn+8A2aMXTWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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