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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e029e17ef1d7410d7f1d0e8f6de03eb389a8e1f7586316454b182da4d9f3fbd' 
  AND token = 'iSXljYfmFq4dj86Y05SzwvZlrWF18qQWyZQR7QIo3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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