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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767511b9e4de77879200754ac3f4a8891f29f7097edb5b66f286386486848b72' 
  AND token = 'hk/EBpLhTULJ7u856XasVvLqOedWGYn8JbPVG5cdQMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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