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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e96fb8d712979292b59e98099bc1db007da63967988fcbf2b3fbc797fc359f' 
  AND token = 'XjZbrT6vxBYJbzIsF17i+jT4gNkzMQKmWZR19vfqir4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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