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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32c188f0f1b5b588760c4da2bb91da21648f3fafad83b1e6bd4e3406074c29b' 
  AND token = '4AGtwO/bi/J5OvwI4CftPbe8lEhfuN2RvztVoFBBeQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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