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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bf246db8d678bd9e6c0ba149ddabd4a74597697768ca20bcd3243d12a47cae' 
  AND token = 'lFhl+BZAO1DzVIwRy28AOEwZJ62aKAhmdwsxS/+0MZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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