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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69944c0a343e5745bc9c164987a760a29e97182e06522a2573322ec97c507e55' 
  AND token = 'QuvSlpHc7WpolqlSSlZdnOcoZPh9N7HvfAklOo/QE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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