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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a0e16771c062f82d3c0145df3c72ea13e94774237f2908dfc3c03d21e853bd' 
  AND token = 'K/nOMhPpE+w6S0nLJ2t6OqA3sUTi/XSX8zhyQ7NO2Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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