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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25444d5c9fbe9c53d57c321ed27866629a01fda29b8d748561dcaac720fcb064' 
  AND token = '7onb7HMk3wLaQwZjuXkmCkUjfT7ECwpdeJqilhmaZIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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