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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2567fade6028dd608586f5cc4c85ededa13460d5abda2e5ea1788ab1dd754a68' 
  AND token = 'U+O2hLhl1UBhNsduxRgmjwGZbQa7ujRu4A45AfW1ZoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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