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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3070201d4cf608c47f6e28ddb0d9a5b37bc14f3291c05d67f1818f00ce97b3a6' 
  AND token = 'zm1yDvw7mwEF+F8/Vfoxi2emfPTP8PkxTbK+gp/M5fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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