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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0072010b0e006f6becb9b59aed34bf9c360aeae715933aedfa539186ba773a' 
  AND token = '7J5smajVTPNrHWYS843TvQgjXVErqG8N/fceKvoGmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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