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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6deae4095c203bb88d0e9adb50a9fd4dfdd9ae6d00cc395a3fb220fe20c3500c' 
  AND token = '2bXWBlpNVo5yKyc8eLVt0AOt75LMxgCPQObc1kIO0R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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