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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555bdbc2dc9953d437ecaf353dcf374b8886c3c385b815a126e0f505b7250f5e' 
  AND token = '/XTdKU6OrU7pcFDMRts4DxO9xMyM5+PKeK/v1zpxrp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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