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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2eda640734408d8f4c2ee66cc48f5026f124200d7715cc05ac57b7360e2dae' 
  AND token = 'U50fEC5K2FfBVI2k3O9zUlha810cgYRYIGxI9oZqlaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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