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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b6598103a430c976dca11ad63123ab47d533cb51da9c32d47f249100267e6c' 
  AND token = 'nr2iLCSYcFth913RKyZn+9cck70QbXNkoWId0k0CGVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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