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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f45627d9b617134e84a3e866ea02ad5dc2fb6920286024ccaba99d604a01a53' 
  AND token = 'NuiVT8B3iPF0LorLTJchO7BzvgQs1XvwNfHycVoa5Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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