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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d58017c3def9e49c3b67702d7b86c583eb3ed473f9d7b61bbdd8235d57e9b2' 
  AND token = 'czGFr0G6gr2o7w0bVl4ug41q5I/pneYTkS7WYDKU2Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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