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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b8d23940149004f1c32ae2f714b37cc5e2547068ed205101ba361ebf82fe6f' 
  AND token = '6buSO0U9//SwJwgjDrOqQ1y+kLVea+ep5EHC0yjeKOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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