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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13619376a0b5a64ec4ea5058b746fa59f8ea4f971087d75b8b69bc725d87fa10' 
  AND token = 'eXlAP082C55X6iOtUMLz4u5k0a7W2TOSSbaGxUVh2Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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