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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a186b9253497529028e6d9b3c4eaa83f8c8aecfeea577f879ada6982855544' 
  AND token = 'Jlszbntqr3lZ9tN4WRdukAiIkebhvVEojY89xTDxsm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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