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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a033ad0207006874151bfc2cbf68380eb5636aea443b02c882cc8c792589d782' 
  AND token = 'K6IarKYA/m/J6D7G/z7WVjAF9k218V7SZKnprNatTuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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