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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f87db2df687bab53701246f1c4c3e933740b8b6c4d7b65507ab79fbf261b3c9' 
  AND token = 'ckckeSbXoRHSNABBoVE29lK0t153WePTCRev2K5nacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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