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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebd37b04b7a39855f0643aaaa16c0952983611291f3e390dc764f2b1fbe7b0b' 
  AND token = 'btZYrhkmDVk3RkFXalBfCoyFb99bym0QcELHrF87M+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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