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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd84b7a5f6e707e9f375bb5580b2f2dea0e329a2644f8d63c96c049a3c365a53' 
  AND token = 'u2l1jh1CDH5xkHyJO4OABYPxVaV7YC98X5VpNajbRo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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