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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e1dd7f410281d04a4f60d094b70c8c9d3741076abc32bc463a7abc4c8fae2f' 
  AND token = '6CnKxLVtAuF1SQOQRAQhgLkx5qVQHwHqhhCLxTxZKrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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