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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e5afbfc3974d17aa6eed669d43b63adcaad114c5d8ebcee000735c3c2df081' 
  AND token = 'VQCcIk2Bbmhb5R8eCtVK31HM59BmpfGz6lPV2pfxpOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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