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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4ba0231570e1e775841e94843cd3c1bd98b9af4b2f59b41104ebed7bf38c4c' 
  AND token = 'mC3IYEeOYh66fQv17vxypK19xl/LRxUQy7f2ah3/Rsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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