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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5b4b8327e35df4774bb792bb878cbd6c82d4cdac34e0eed508f99f2613fddc' 
  AND token = '4/oZY7fCP5MNPybqGeAdvLuIqyIrkQf4zugfJKQJ+ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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