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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18698ebf8af340375d33c1b49ffbb6f4edda327bd2a7fe291fb7d8dd6153c19f' 
  AND token = 'kixC8UGLanY9tMf2UlLoVtph3QRk6iY5FqRPELhf3cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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