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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf6109a473d61b40aacdac5083d597397bb1de8d961e8cda38106594f02cb87' 
  AND token = 'UI/e/frcPDc3TpuNpGrdABxKFzVp57NTBt5YUMaylh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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