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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e87e45ea3c59d640e4f364fa0fe0f6e4d0a4e85603a9b041022edbf803c960' 
  AND token = '5hVcZ/DAPUp9SR1SQvd425X+yTfCovDrdiGV62z4U2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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