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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807fd69059ec826dad12e6a2490a96d80b4bc37f3f1f14be5828fa2eb3eb5976' 
  AND token = 'D/nbWAbqnzpD5ruELF39f0G3jYeu0C/DDo/yRrh9GTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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