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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3dd295ff778a5c42ca5baa99329cd54f44c856c577400b88a0c7125a699d4a' 
  AND token = 'tQZ1lC4KxN6cDTPuw0BrseJW14m2SGswNlTyfiqU7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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