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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4efe2996d4ba8e5c78addbf06c0b9c9dfb8d9e1fe24e8cf8971c5d11f417dc3' 
  AND token = 'jAGm5aSQ9RoMJc/sM5JGwI2jM7rW17wWU29GVzIBbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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