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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b96edda53e2d09fbb761c6b79968a37c1f060dff54b35e5093709d070cae856' 
  AND token = 'kir/vgAcRQ5uD7XJY8PWqyl7pT0blJubfXVDVLekuAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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