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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b190e6068c57b87c02c43e57e14aa9bd347aa2fc596be5e5f3a3c82030346e8' 
  AND token = 'BvhkbeRQ+aqOhra5lC7ceX60qG9W2rny0l9CtzCY068=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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