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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07638cc90cf5b67793b99bca5f5e54501bdcf13c8bb1c1d989ae5cab7c7321d2' 
  AND token = 'TNVi0wLI4sHIPjDc9knaa9kFLJist4VGIkdvC2deM9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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