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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc42886fb5550e917ab7506fc97385096116a35552a82cb8375efd4f439411a' 
  AND token = '2e+9tqwMVG8ycpwKblm1MIYj2E/9KNsxOV5/ODmq0/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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