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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96d563cf419c70149c732f7e727813d3e7d94c3f6ac8bf3f06f408843e3b9e4' 
  AND token = 'kP2XoZ1Yor2kCs8Vq0LkdWikDDh52ESSngVYlnlzjCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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