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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8496c7b00ae12f23403f32b45fc204c5702408967c6e2eee14700ffe5e1cf5' 
  AND token = 'AEPZhBJmkS15fll2gOQaRpjewPAQi1dK1tixIzD3M70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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