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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025b7d2f39db94a4eea5cd410a5d99037d1dec8eeee72446cc9a5ce4b38409dd' 
  AND token = 'yST2DVY0pMdNGW7crA46RVIbWC/hme426//VwncVtqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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