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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1acc709e6ac21eead6e14f2a3f8a005e187ad240361b068a643357df1c7ef8' 
  AND token = 'knr1KH7H7Llb010Ay1ppC7VwowyN+0GODL7KvzQw0eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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