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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c31f0345223ac03aa228320b6e2c7553c2ce404dc2f51a8d401c2f81d039d2f' 
  AND token = 'wTQfB664wjGlHu5m+WYFrUN9ce9GtEAifXfxQr9k5RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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