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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2b42e23e023ccaef3bcd07ca62534e520bff875ba9701a3ab0bcf2fb87bb62' 
  AND token = 'g8bFe2ujgFF9b4iFZHqTokynBPBbQdNYUpj22FHxmN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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