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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b028801aad6401a26064fd6cd65cfdc8eadd1a61d8912414b771912eb98ab72' 
  AND token = 'zAqSNlcGF2eOZ8usWD8Dyfs+5ozMePgOgPlu2/0F8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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