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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fd19daafc1663ed294a091a3ac8a711e0e12b3fdaa503ac2632ee2c0351779' 
  AND token = 'U6/Z5WinbmadOeOpKIdcB9GNqrnePAzoCKxo1VL5t1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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