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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59c95ae562bf19ae023ae680aef52f3110eed2c99904517f1365cf2cb8ffc3a' 
  AND token = '/dZ1hrdMVMyCIxTcaJZ2GdiyHAeG0tJY1qHOMKWvF3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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