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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5c23bf649da5c73d7222cc3551d447fd04a198886ace6b8cb45f68857af461' 
  AND token = 'Apo63DR1M/Vf/SNwqdLHglX4F5vQGcAndSEq2jhc/xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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