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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d4be92f1babfbd0397bbeba30c34dc5d784f618899ee3ea048bbcdb0fe0416' 
  AND token = 'd/RGs1WqycwsF7zdL2Lln5BhV6a9EHvW/jmcVNccgns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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