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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60e3b3e3e055c60892b09f34c9ea443b8aa7c7f493c1a6fc807ccd7b4cb5255' 
  AND token = 'A/8a2aoB5rRdl2k8OYjrwa+O5qB8xajHenVDZmaykiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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