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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745a8226b6643ecb91be892cbadbc37a5eff5241a60a76c16bb380d0dbf89087' 
  AND token = 'xmclRiwGm0O76NkD/Sdm1jxva5GVRUMAEoRMzl5IF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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